From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nathan Sullivan <nathan.sullivan@ni.com>
Subject: Re: [PATCH] net: macb: Do not enable RX buffer used interrupt
Date: Mon, 4 May 2015 17:18:04 -0500
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On Mon, May 04, 2015 at 12:43:15PM -0500, Nathan Sullivan wrote:
> This driver does not handle the RX buffer used interrupt, nor does
> it need to due to handling the RX overflow interrupt already.  Enabling
> the interrupt would lead to an infinite loop in the ISR.
>

Well, that may have been premature.  We are seeing the RXUBR interrupt get
stuck asserted on Zynq hardware, and I failed to realize the driver clears
RXUBR already in macb_interrupt...  Not enabling that interrupt keeps my 
system responsive, but it's not the correct solution to this issue.